I opened my daycare when my youngest was 9 months old. At that time I had all 12 month olds and 1 6 year old boy B/A school. I ended up terming the SA for various reasons but none had to do with me breastfeeding.
I did not cover up during the day around the other toddlers, they barely noticed actually.
So much more convenient while sitting and reading books or sitting while the toddlers free played or I helped with puzzles etc to nurse than have to get up and heat a bottle. Heck I even nursed in my chair outside in our backyard while the kiddos played! A sling or carrier helps alot too!
I am now pregnant with #5 and due in March and plan on doing the same thing again. Same kiddos just older now and I am sure they will all be fine. All are quite curious about the baby in my belly already!